You run a team with a needs list. Thirty-two mystery players sit on the board and one case is yours, held and blind. Open the others round by round, weigh the Banker's draft-pick offers, and make the call: take the pick, or ride for the star in your case. Your haul gets graded against your roster needs. New board every day.
One hidden player is locked in your case. As you open the other cases, the Banker offers draft picks to buy you out. Deal and you take the pick; ride and you keep whoever is in your case.